Assigjtoe of one-half to



(No Model.) J. S, SMITH.

TILE MACHINE.

.N0,296,477. Patented A 'r'.s ;1s84.

WITNESSES UNITED STATES JOHN S. SMITH, OF JACKSON, MICHIGAN, ASSIGNOR OFONE-HALF TO THEADORE G; BENNETT, OF SAME PLACE.

TILE-MACHINE.

$PECIPICATION forming part of Letters Patent No. 296,477, dated April 8,1884.

Application filed November 30, 1883. (No model.)

To all whom it may concern:

Be it known that I, JOHN S. SMITH, of Jaclc son, in the county ofJackson and State of Michigan, have invented a new and usefulImprovement in Tile-Machines, ofwhich the following is a specification.

My invention relates to the worm-conveyor employed in tile-machines forforcing the clay in a plastic condition through the die in which thetubes are formed. In such machines regularity in feed is indispensableto the proper producing of the pipe. .If one end of the spiral flangebecomes broken, so that one thread operates more perfectly than theother,

expense of repairs may be avoided.

the consequence will be crooked and-badlyformed tubes. Thesespiralflanges are pref erably double, and it frequently happens from breakingor wear they lose their uniformity, and consequently fail to produceuniform work. The pressure being principally on the end of the flangesnearest the die, the wear there is greater than on the other end, and inall cases the wear is greater on the face of the flange toward the diethan it is on the other. In cgnsequence, it is necessary at shortintervals to replace the worm and put in a new shaft. erative mechanismmost exposed to wear that my invention is intended.

It consists in forming the flanges in sections, of a half -revolutioneach, on semi-annular sleeves, which may he slid onto the shaftindependently, and which, being alike, maybe reversed or interchanged asthey become broken or worn, and so much of the delay and Some of theseadvantages have been attained by substituting for the solid shaft andspiral flange in common use a sectional tubular sleeve carrying the twospiral flanges with ahalf-revolution on each section, and attached byslipping onto the shaft, which, as well as the eye of the section, issquare. My invention is an improvement on this plan in the followingrespects: First, the flanges of adjoining sections meet more closely andfit more neatly to one another, thereby avoiding waste of powersecond,the sections, instead of being circular, are semicircular, andare therefore more cheaply cast, not requiring a dry-sand core, and moreconveniently adapted to casting on It is to facilitate this repair ofthe 0pa chill, which, being placed only mule lower half of the flask,does not interfere with the venting through the upper section; third, incase of breaking of one flange only it is not necessary to replace bothflanges; and, finally, the halfsections can be removed and replacedwithout taking off the die-plate, it being only necessary to take offthe conical core, which is hung on the reduced end of the shaft. Thesemicircular section can then be slid forward onto the reduced end A,and then taken out by swinging it part round, whereas for the removal ofatubular section the die-plate must be removed, and wh e11 replaced by anew one the work of adjusting the annulus must be carefully performed,which is unnecessary in my construction, for the halfcircular sectionmay he slid into place without disturbing either the shaft or thedie-plate.

In the annexed drawings, making part of this specification, Figure 1 isan elevation of the outer end of the shaft. Fig. 2 is aview of one ofthe flange-sections detached, and Fig. 3 is a transverse section.

, The same letters are employed in all the figures in the designation ofidentical parts.

A is the shaft, which in machines of this i class is either placed underthe pug-mill to receive the clay as it is tempered and force it throughthe die or else in a casing receiving the clay from a hopper andcarrying it toward the die, through which it forces it.

B is the core of the die, hung on the end of the shaft A, reduced toreceive it. Instead of casting the spiral flanges with the shaft, theyare built up of sectional pieces, each forming a half of a sleeve, 0,surrounding the shaft, and having each one halfrevolution. of the flangecast with it and running from corner to corner, so that the sections areduplicates each of the others. These sections are each formed with afeather, C, along the inner edges,which is received in the grooves ASAicut longitudinally in the outer end of the shaft. The worm is formedby sliding these sections in pairs onto the shaft, and confining them bythe end of the truncated conical core B. If any of the flanges becomebroken or worn, the sections may be reversed or replaced by others lessexposed, or, if useless, by new ones. Thus,with

little delay and at small expense, the flanged changeable sections 0 O,substantially as and for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of twoattesting wit- DGSSGS.

JOHN S. SMITH.

In presence of- J OSEPH H. 0013B, JNo. G. MUNDY.

